Apparatus and method for managing access among devices

ABSTRACT

Provided are a method, system, and computer storage device for managing zone information for devices in a network. A zone group table includes entries for different pairs of zones, wherein each entry indicates whether access between a pair of the zones is permitted. An attribute zone table indicates whether devices in the zones are initiator, target and/or initiator/target. For a selected zone, indication is made of whether ports in the devices in the selected zone have an initiator, target and/or initiator/target attribute as indicated in the attribute zone table. A determination is made as to whether all the ports in the devices in the selected zone have the same attribute of initiator, target or initiator/target. If so, a division proposal is indicated for the selected zone proposing to separate devices in the selected zone into at least one new zone.

CROSS-REFERENCE TO R ELATED FOREIGN AND DOMESTIC APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.13/447,010, filed on Apr. 13, 2012, which application is a continuationof U.S. patent application Ser. No. 12/502,193, filed on Jul. 13, 2009,which is a non-provisional application that claims priority benefitsunder Title 35, Unites States Code, Section 119(a)-(d) from JapanesePatent Application entitled “APPARATUS AND METHOD FOR MANAGING ACCESSAMONG DEVICES” by Yoshitaka Matsumoto, Yoshihiko Terashita, and HiroyukiTanaka, having Japanese Patent Application Serial No. 2008-182877, filedon Jul. 14, 2008, which U.S. Patent Applications and Japanese PatentApplication are incorporated herein by reference in their entirety.

BACKGROUND

1. Field of the invention

The present invention relates to an apparatus and method for managingaccess among the devices. More particularly, the invention relates to anapparatus and method for managing access among a plurality of devicesaccommodated in one chassis.

2. Related Art

In recent years, the server has a lower price, and each enterprise canintroduce the server relatively simply. Accordingly, each enterprisepossesses a number of servers, whereby there is a growing demand forlower operation management cost of the server and space saving. Thus,the number of companies introducing a blade server system as the productfor meeting such demand has grown. The blade server system is the systemin which a plurality of servers or devices such as a storage arearranged at high density in one chassis (chassis).

By the way, in such system in which the plurality of servers or devicessuch as a storage are arranged in one chassis, the data integrity maynot be ensured if the access control between these devices isappropriately performed. For example, supposing that immediately after acertain server reads data in a storage, another server overwrites datain the same storage, the data integrity may not be ensured. To avoidsuch a situation, the blade server system generally has a zoningfunction. Nowadays, an SAS (Serial Attached SCSI) has become themainstream as the next generation interface for a SCSI (Small Computer

System Interface), and the zoning specifications are defined in SerialAttached SCSI-2 (SAS-2) Standard Working Draft.

In this zoning function, whether access is permitted among the SASdevices such as an SAS host bus adaptor (SAS HBA) on the blade server, adisk drive module (DDM) in the blade server system, and a RAIDsub-system or SAS HBA connected to an external port in the same bladeserver system is decided based on a zone permission table. It isrequired that the setting of the zone permission table is made by theadministrator, but it is very inefficient that all the zonings aremanually set, easily causing a mistake.

Thus, some of the blade server systems mount a function of incorporatingseveral kinds of zoning settings supposedly having high use frequency asthe preliminary definitions to reduce a trouble or mistake in settingthe zoning as much as possible.

Herein, conventionally there are various techniques for the zoningsetting (e.g., refer to Japanese Patent Publication No. 2002-063063,published Feb. 28, 2002). In Japanese Patent Publication No.2002-063063, an area in the storage device to access from the host sideand a fiber channel adaptor (FCA) and a host bus adaptor (HBA) for usein gaining access to the storage device are set up in the integratedstorage controls for integrally controlling the SAN, and the integratedstorage controls make the storage setting, the zoning setting and thesetting of the area to which access is permitted to an SAN managementcomponent of the host, a zoning setting component of the switch and astorage management component of the storage device, based on thisinformation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram showing the overall configuration of a blade serversystem according to an embodiment of the present invention;

FIG. 2 is a diagram showing a functional configuration example of a zonemanagement module according to the embodiment of the invention;

FIG. 3 is a flowchart showing an overall operation example of the zonemanagement module according to the embodiment of the invention;

FIG. 4 is a view showing the examples of the table for use in a firstoperation example of a validity verification process according to theembodiment of the invention;

FIG. 5 is a view showing the examples of the table for use in the firstoperation example of the validity verification process according to theembodiment of the invention;

FIG. 6 is a flowchart showing the flow of the first operation example ofthe validity verification process according to the embodiment of theinvention;

FIG. 7 is a view showing the examples of the table for use in a divisionverification process in a second operation example of the validityverification process according to the embodiment of the invention;

FIG. 8 is a flowchart showing the flow of the division verificationprocess in the second operation example of the validity verificationprocess according to the embodiment of the invention;

FIG. 9 is a view showing the examples of the table for use in a mergeverification process in the second operation example of the validityverification process according to the embodiment of the invention;

FIG. 10 is a flowchart showing the flow of the merge verificationprocess in the second operation example of the validity verificationprocess according to the embodiment of the invention;

FIG. 11 is a view showing the examples of the table for use in apermission verification process in the second operation example of thevalidity verification process according to the embodiment of theinvention; and

FIG. 12 is a view showing the examples of the table for use in thepermission verification process in the second operation example of thevalidity verification process according to the embodiment of theinvention.

SUMMARY

Provided are a method, system, and computer storage device for managingzone information for devices in a network. A zone group table includesentries for different pairs of zones, wherein each entry indicateswhether access between a pair of the zones is permitted. An attributezone table indicates whether devices in the zones are initiator, targetand/or initiator/target. For a selected zone comprising one of the zonegroups indicated in the zone group table, indication is made of whetherports in the devices in the selected zone have an initiator, targetand/or initiator/target attribute as indicated in the attribute zonetable. A determination is made as to whether all the ports in thedevices in the selected zone have the same attribute of initiator,target or initiator/target. A division proposal is indicated for theselected zone proposing to separate devices in the selected zone into atleast one new zone in response to determining that all the ports in theselected zone do not have the same attribute.

DETAILED DESCRIPTION

In this way, described embodiments seek to reduce the trouble andmistake of setting the zoning as much as possible in a blade serversystem.

However, with the method for incorporating several kinds of zoningsettings supposedly having high use frequency as the preliminarydefinitions as described above, a fixed zone permission table is used,whereby there is a great deal of room for further improvement,considering a case where the user wants to set a complex zone permissiontable. Some products at present require the setting of 128 rows×128columns in the zone permission table, but there may be a need to expandthe number of rows and the number of columns in the future.

It should be noted that the technique of Japanese Patent Publication No.2002-063063 involves setting the zoning but does not reduce the troubleor mistake of setting the zoning.

It is an object of the embodiments to reduce the trouble and mistake inmaking the setting on access among a plurality of management units.

In order to accomplish the above object, the embodiments provide anapparatus for managing access among a plurality of devices accommodatedin a chassis, comprising an acceptance part for accepting settinginformation by the user on access between a first management unitincluding at least one device of the plurality of devices and a secondmanagement unit including at least one device of the plurality ofdevices, an acquisition part for acquiring the first attributeinformation designating at least any one of an instruction issuingfunction and an instruction receiving function among the functions ofthe first management unit and the second attribute informationdesignating at least any one of the instruction issuing function and theinstruction receiving function among the functions of the secondmanagement unit, a determination part for determining whether or not thesetting information accepted by the acceptance part is consistent with acombination of the first attribute information and the second attributeinformation acquired by the acquisition part, and an output part foroutputting information based on a determination result of thedetermination part.

The setting information may include the setting of permitting accessbetween the first management unit and the second management unit, andthe output part may output information designating that the setting iserroneous, if the determination part determines that the settinginformation and the combination are inconsistent. In this case, thedetermination part may determine that the setting information and thecombination are inconsistent, in any one of the case where both thefirst attribute information and the second attribute informationdesignate the instruction issuing function and do not designate theinstruction receiving function and the case where both the firstattribute information and the second attribute information designate theinstruction receiving function and do not designate the instructionissuing function.

Also, the setting information may include the setting of not permittingaccess between the first management unit and the second management unit,and the output part may output information designating that the settingis changeable, if the determination part determines that the settinginformation and the combination are inconsistent. In this case, thedetermination part may determine that the setting information and thecombination are inconsistent, if one of the first attribute informationand the second attribute information designates the instruction issuingfunction and the other designates the instruction receiving function.Also, the determination part may determine that the setting informationand the combination are inconsistent, if one of the first attributeinformation and the second attribute information designates theinstruction issuing function and the instruction receiving function andthe other designates the instruction receiving function.

Further, the first management unit may comprise a plurality of devices,and the output part may output information designating that a managementunit comprising some of the devices can be divided from the firstmanagement unit, in at least any one of the case where some of thedevices included in the first management unit have the instructionissuing function and do not have the instruction receiving function, andthe case where some of the devices included in the first management unithave the instruction receiving function and do not have the instructionissuing function.

Furthermore, the output part may output information designating that thefirst management unit and the second management unit can be merged, inat least any one of the case where the setting information includes thesetting of permitting access between the first management unit and theother management unit having the instruction receiving function andpermitting access between the second management unit and the othermanagement unit, and both the first attribute information and the secondattribute information designate the instruction issuing function and donot designate the instruction receiving function, and the case where thesetting information includes the setting of permitting access betweenthe first management unit and the other management unit having theinstruction issuing function and permitting access between the secondmanagement unit and the other management unit, and both the firstattribute information and the second attribute information designate theinstruction receiving function and do not designate the instructionissuing function.

Further embodiments provide an apparatus for managing access among aplurality of devices accommodated in a chassis, comprising an acceptancepart for accepting setting information by the user on access between afirst management unit including at least one device of the plurality ofdevices and a second management unit including at least one device ofthe plurality of devices, an acquisition part for acquiring the firstattribute information designating at least any one of an instructionissuing function and an instruction receiving function among thefunctions of the first management unit and the second attributeinformation designating at least any one of the instruction issuingfunction and the instruction receiving function among the functions ofthe second management unit, a determination part for determining thatthe setting information accepted by the acceptance part is inconsistentwith a combination of the first attribute information and the secondattribute information acquired by the acquisition part, if the settinginformation includes the setting of not permitting access between thefirst management unit and the second management unit, the setting ofpermitting access between the first management unit and the managementunit having the instruction issuing function, and the setting ofpermitting access between the second management unit and the managementunit having the instruction issuing function, and one of the firstattribute information and the second attribute information designatesthe instruction issuing function and the instruction receiving function,the other designating the instruction receiving function, and an outputpart for outputting information designating that the settings arechangeable, if the determination part determines that the settinginformation is inconsistent with the combination.

Further embodiments provide a system composed of a plurality ofapparatuses accommodated in a chassis, comprising a first apparatushaving an instruction issuing function, a second apparatus having aninstruction receiving function, a determination apparatus fordetermining whether or not the setting information by the user on accessbetween a first management unit including the first apparatus and asecond management unit including the second apparatus is consistent witha combination of the first attribute information designating whether thefirst management unit has the instruction issuing function or theinstruction receiving function and the second attribute informationdesignating whether the second management unit has the instructionissuing function or the instruction receiving function, and an outputapparatus for outputting information based on a determination result ofthe determination apparatus.

Further embodiments provide a method for managing access among aplurality of devices accommodated in a chassis, comprising acceptingsetting information by the user on access between a first managementunit including at least one device of the plurality of devices and asecond management unit including at least one device of the plurality ofdevices, acquiring the first attribute information designating at leastany one of an instruction issuing function and an instruction receivingfunction among the functions of the first management unit and the secondattribute information designating at least any one of the instructionissuing function and the instruction receiving function among thefunctions of the second management unit, determining whether or not thesetting information is consistent with a combination of the firstattribute information and the second attribute information, andoutputting information based on a determination result of thedetermination.

With the described embodiments, it is possible to reduce the trouble andmistake of settings on access among the plurality of management units.

The embodiments will be described below in detail with reference to theaccompanying drawings.

Further, a blade server system to which the embodiments apply will bedescribed below.

FIG. 1 is a diagram showing a hardware configuration example of thisblade server system 10. The blade server system 10 comprises the bladeservers 11 a to 11 f, the storage modules 12 a and 12 b, and theexternal ports 13 a to 13 d, as shown in FIG. 1. Also, the blade serversystem 10 further comprises an SAS connectivity module 14, a systemmanagement module 15 and a zone manager module 20.

Each of the blade servers 11 a to 11 f is a server shaped like a blade,each blade comprising the components such as a microprocessor, a memory,a network controller and a hard disk drive. Each of the blade servers 11a to 11 f is mounted in a blade server bay, but can be removed. In FIG.1, six blade servers 11 a to 11 f are illustrated, but the number ofblade servers is not necessarily limited to six. It should be noted thatif it is not required to distinguish the blade servers 11 a to 11 f,they are also simply referred to as “blade server 11”. Each of thestorage modules 12 a and 12 b comprises six 3.5 type hard disk drives,for example, and functions as storage means for storing various kinds ofdata. Each of the storage modules 12 a and 12 b is mounted on thestorage module bay, but can be removed. In FIG. 1, two storage modules12 a and 12 b are illustrated, but the number of storage modules is notnecessarily limited to two. It should be noted that if it is notrequired to distinguish the storage modules 12 a and 12 b, they are alsosimply referred to as “storage module 12”.

Each of the external ports 13 a to 13 d is the external port on the SASconnectivity module 14 as will be described later. A RAID controller,for example, can be connected to each of the external ports 13 a to 13b. In FIG. 1, four external ports 13 a to 13 d are illustrated, but thenumber of external ports is not necessarily limited to four. It shouldbe noted that if it is not required to distinguish the external ports 13a to 13 d, they are also simply referred to as “external port 13”.

The SAS connectivity module 14 manages the connection between the SASdevices such as the blade servers 11 a to 11 f, the hard disk drives inthe storage modules 12 a and 12 b, and the RAID controller, for example,connected to the external ports 13 a to 13 d. More specifically, the SASconnectivity module 14 has a zone permission table (hereinafter referredto as a “ZP table”), and performs the SAS zoning based on the settingsin the ZP table. The SAS connectivity module 14 is mounted in an I/Omodule bay 3 or 4, but can be removed.

The system management module 15 is the module for providing a connectionfunction with a network, and functioning as a user interface.

The zone manager module 20 verifies the validity of the ZP tablegenerated based on setting information received from the systemmanagement module 15 based on the attribute of the SAS device port(hereinafter simply referred to as a “port”) received from the SASconnectivity module 14.

That is, in this embodiment, the zone manager module 20 verifies thevalidity of access between the ports set in the ZP table based on theattribute of port, and automatically discriminates the optimal ZP table.

More specifically, the optimal ZP table is discriminated in accordancewith the following procedure.

First, the zone manager module 20 determines whether the attribute ofport is initiator or target, or the attribute can become initiator andtarget, and generates an initiator/target table (hereinafter referred toas an “I/T table”) based on this determination result. Herein, aninitiator is the attribute of device that issues an instruction to otherdevices connected by the SAS. A target is the attribute of device thatreceives an instruction from other devices having the attribute ofinitiator. Also, the attribute that can become the initiator and targetis hereinafter denoted as “initiator/target”.

Next, the zone manager module 20 verifies the validity of setting in theZP table based on the attribute of the SAS device port. And the zonemanager module 20 raises a warning or recommendation interactively tosupport the user on the setting operation of the ZP table. In thissupport, the kind of device (server, disk, RAID controller, etc.),namely, the attribute of port is used as auxiliary. For example, thepriority of recommendation is adjusted based on the attribute of port.Also, if the attribute of port is RAID controller, the priority ofrecommendation is increased using a knowledge base, because a backupagent function is provided at high possibility.

In the SAS2 zoning, a plurality of ports can be included in one zonegroup ID (hereinafter referred to as a “ZGID”). Accordingly, theassignment of ZGID and port is made one-to-one, or 1-to-N. It is onlysupposed that the assignment of ZGID and port is made one-to-one in theabove description of FIG. 1, but if the assignment of ZGID and port ismade 1-to-N, it is necessary that the port is replaced with ZGID. Thatis, if the assignment of ZGID and port is made one-to-one, the port isused as one example of a first management unit and a second managementunit including at least one device of a plurality of devices in thisembodiment. Also, if the assignment of ZGID and port is made 1-to-N,ZGID is used as one example of the first management unit and the secondmanagement unit including at least one device of the plurality ofdevices.

Also, a method of generating the I/T table is different depending onwhether the assignment is made one-to-one or 1-to-N.

Further, if the assignment of ZGID and port is 1-to-N, the port to beincluded in the same ZGID is obtained for recommendation.

Though the zone manager module 20 is configured independently from theSAS connectivity module 14 in this embodiment, the zone manager module20 and the SAS connectivity module 14 may be configured as integral.

The functional configuration of the zone manager module 20 forperforming the above operation will be described below.

FIG. 2 is a block diagram showing a functional configuration example ofthe zone manager module 20.

The zone manager module 20 comprises a ZP table generation part 21, a ZPtable storage part 22, an I/T table generation part 23, an I/T tablestorage part 24, a validity verification part 25, a message output part26 and a ZP table output part 27, as shown in FIG. 2.

The ZP table generation part 21 receives the setting informationregarding access permission between the SAS devices or between the ZGIDsfrom the system management module 15, and generates a ZP table storingthe setting information. In this embodiment, as one example of theacceptance part for accepting the setting information by the user, theZP table generation part 21 is provided.

The ZP table storage part 22 stores the ZP table generated by the ZPtable generation part 21.

The I/T table generation part 23 receives an attribute of port from theSAS connectivity module 14, and generates an I/T table storing which theattribute of each port or each ZGID is, initiator, target or both, basedon the attribute of port. In this embodiment, as one example of theacquisition part for acquiring the attribute information, the I/T tablegeneration part 23 is provided.

The I/T table storage part 24 stores the I/T table generated by the I/Ttable generation part 23.

The validity verification part 25 verifies the validity of a setting inthe ZP table stored in the ZP table storage part 22 by referring to theI/T table stored in the I/T table storage part 24. In this embodiment,as one example of the determination part for determining whether or notthe setting information is consistent with the combination of attributeinformation, the validity verification part 25 is provided.

The message output part 26 outputs a message indicating the verificationresult of the validity verification part 25 to the system managementmodule 15. In this embodiment, as one example of the output part foroutputting the information based on the determination result, themessage output part 26 is provided.

The ZP table output part 27 applies the ZP table by notifying the ZPtable stored in the ZP table storage part 22 to the SAS connectivitymodule 14.

The operation of the zone manager module 20 will be described below indetail.

Herein, there are two cases where the assignment of ZGID and port ismade one-to-one and 1-to-N, as described above. Thus, the former will bedescribed as a first operation example and the latter as a secondoperation example.

FIG. 3 is a flowchart showing the main flow of the zone manager module20 in the first operation example.

If the user inputs the setting information for the ZP table via thesystem management module 15 in conventional manner, the ZP tablegeneration part 21 in the zone manager module 20 accepts the inputsetting information (step 201). And the ZP table in which informationbased on the setting information is set is generated and stored in theZP table storage part 22 (step 202).

Then, the I/T table generation part 23 acquires the attribute of portfor the SAS device via the SAS connectivity module 14 from each SASdevice (step 203). The SAS device may be any of the devices mounted onthe blade server system 10, or only the devices included in the ZPtable. Also, there are three kinds of the attribute of port, initiator,target and initiator/target, as described above. And the I/T tablegeneration part 23 generates the I/T table, based on the attribute ofport for the SAS device, and stores it in the I/T table storage part 24(step 204). The I/T table is the table setting which the attribute ofport for each SAS device is, initiator, target or initiator/target.

Thereafter, the validity verification part 25 verifies the validity ofsetting in the ZP table stored in the ZP table storage part 22 byreferring to the I/T table stored in the I/T table storage part 24 (step205).

If there is room for improvement or a setting error in the ZP tablestored in the ZP table storage part 22, the message output part 26 makesa proposal for reform plan for the ZP table set by the user ornotification of an error via the system management module 15 to the user(step 206).

The user takes an appropriate action to the proposal or errornotification. That is, the user inputs the reset information for the ZPtable. Then, the ZP table generation part 21 accepts the input resetinformation (step 207). And the ZP table stored in the ZP table storagepart 22 is changed based on the reset information and the ZP table afterchange is stored in the ZP table storage part 22 (step 208).

As a result, the ZP table stored in the ZP table storage part 22 getsrid of the setting error, whereby the ZP table has no room forimprovement, or becomes in a state undesired by the user even thoughthere is room for improvement. Then, the ZP table output part 27notifies the ZP table stored in the ZP table storage part 22 to the SASconnectivity module 14 (step 209). The finally decided ZP table issubsequently applied on access between the SAS devices.

A process in accordance with the flowchart of FIG. 3 will bespecifically described below.

At first, a case where the attribute of port is initiator or target willbe described below.

FIG. 4 is a view showing the examples of the table generated in thiscase.

First, the user sets the ZP table, and the ZP table generation part 21stores the ZP table in the ZP table storage part 22 at step 202. Theuser may set the ZP table as shown in FIG. 4( a). In the first operationexample, identification information of the SAS device is set in the rowand column of the ZP table. The “OK” in the table indicates that accessbetween corresponding SAS devices is permitted.

Also, the I/T table generation part 23 creates the I/T table and storesit in the I/T table storage part 24 at step 204. Since the attribute ofport is initiator or target in this example, the I/T table as shown inFIG. 4( b) is created. That is, the attribute of port for Blade1 is setas initiator, and the attribute of port for Disk1 and Disk2 is set astarget.

The validity verification part 25 performs a validity verificationprocess based on the ZP table as shown in FIG. 4( a) and the I/T tableas shown in FIG. 4( b) at step 205. In this validity verificationprocess, information on accessibility to any other combination than thecombination of SAS devices to which the user sets “OK” in the ZP tablecan be automatically generated. Since it is implicitly known that thedata output destination of Blade1 is Disk1 and Disk2, with a server todisk configuration, from the I/T table of FIG. 4( b), the settings areunchanged as shown in FIG. 4( c).

Secondly, a case where the attribute of port is initiator, target orinitiator/target will be described below.

FIG. 5 is a view showing the examples of the table generated in thiscase.

First, the user sets the ZP table, and the ZP table generation part 21stores the ZP table in the ZP table storage part 22 at step 202. Theuser may set the ZP table as shown in FIG. 5( a). This is the same asshown in FIG. 4( a). The “OK” in the table indicates that access betweencorresponding SAS devices is permitted.

Also, the I/T table generation part 23 creates the I/T table and storesit in the I/T table storage part 24 at step 204. Since the attribute ofport is initiator, target or initiator/target in this example, the I/Ttable as shown in FIG. 5( b) is created. That is, the attribute of portfor Blade1 is set as initiator, and the attribute of port for Disk1 andDisk2 is set as initiator/target.

Thereafter, the validity verification part 25 performs a validityverification process based on the ZP table as shown in FIG. 5( a) andthe I/T table as shown in FIG. 5( b) at step 205. In this validityverification process, information on accessibility to any othercombination than the combination of SAS devices to which the user sets“OK” in the ZP table can be automatically generated. Herein,distinctively, both Disk1 and Disk2 can become initiator, and the systempossibly takes synchronization between Disk1 and Disk2. Accordingly, itis possible to propose to the user that access between Disk1 and Disk2is permitted to improve performance as shown in FIG. 5( c).

Next, the validity verification process by the validity verificationpart 25 at step 205 will be described below in detail.

FIG. 6 is a flowchart showing the flow of the validity verificationprocess in the first operation example.

First, the validity verification part 25 substitutes “1” into variable Xrepresenting the index in the longitudinal direction of the ZP tablestored in the ZP table storage part 22 (step 221). And the subsequentprocess is performed while X is incremented one by one. Herein, when Xis “1”, “2” and “3”, the process is performed taking notice of the firstrow, the second row and the third row from the top in the ZP table.

Next, the validity verification part 25 substitutes “1” into variable Yrepresenting the index in the transverse direction of the ZP tablestored in the ZP table storage part 22 (step 222). And the subsequentprocess is performed while Y is incremented one by one. Herein, when Yis “1”, “2” and “3”, the process is performed taking notice of the firstcolumn, the second column and the third column from the left in the ZPtable.

A process taking notice of a cell in the Xth row from the top and theYth column from the left (hereinafter denoted as a cell (X, Y)) in theZP table will be described below.

The validity verification part 25 firstly discriminates the combinationof the attribute of port for the SAS device in the Xth row from the topin the ZP table and the attribute of port for the SAS device in the Ythcolumn from the left in the ZP table (step 223).

As a result, if it is determined that the combination of the attributesof port is initiator and initiator, or target and target, the validityverification part 25 determines whether or not “OK” is set in the cell(X,Y) (step 224). And if “OK” is set, an error is set in the messageoutputted to the user (step 225), because access between initiator andinitiator or access between target and target is not permitted. Also, if“OK” is not set, an error is not set in the message outputted to theuser and the following process is performed.

Also, if it is determined that the combination of the attributes of portis initiator and target, or initiator and initiator/target, the validityverification part 25 determines whether or not “OK” is set in the cell(X,Y) (step 226).

And if “OK” is not set, a permission proposal 2 is set in the messageoutputted to the user (step 227).

The permission proposal 2 is the proposal indicating that access betweentwo SAS devices of notice may be permitted, with a lower priority thanthe permission proposal 1 as will be described later. That is, in makingthe permission proposal 2, it is considered that a message sentence withweak compelling power is used, or if there is another proposal, theweight is lowered, for example. It should be noted that the reason whythe priority of the permission proposal 2 is lowered is that there is noneed for always making the proposal because of the fundamental setting.

Also, if “OK” is set in the cell (X,Y), the permission proposal 2 is notset in the message outputted to the user and the following process isperformed.

Further, if it is determined that the combination of the attributes ofport is target and initiator/target, or initiator/target andinitiator/target, the validity verification part 25 determines whetheror not “OK” is set in the cell (X,Y) (step 228). As a result, if “OK” isnot set, it is determined whether or not “OK” is set in the cellcorresponding to one SAS device included in the combination noticed hereand the SAS device functioning as the initiator, and “OK” is set in thecell corresponding to another SAS device included in the combinationnoticed here and the SAS device functioning as the initiator (step 229).

And if “OK” is set in these cells, the permission proposal 1 is set inthe message outputted to the user (step 230). For example, thecombination of SAS devices of notice is Disk1 and Disk2 in cell (2,3) ofFIG. 5( a). And “OK” is set in Disk1 that is one SAS device included inthis combination and Blade1 that is SAS device functioning as theinitiator and “OK” is set in Disk2 that is another SAS device includedin this combination and Blade1 that is the SAS device functioning as theinitiator, whereby the permission proposal 1 is set.

The permission proposal 1 is the proposal indicating that access betweentwo SAS devices of notice may be permitted, with a higher priority thanthe permission proposal 2 as previously described. That is, in makingthe permission proposal 1, it is considered that a message sentence withstrong compelling power is used, or if there is another proposal, theweight is raised, for example. It should be noted that the reason whythe priority of the permission proposal 1 is raised is that there ispossibility that a special function such as backup agent may be providedin the port of object.

Also, if it is determined at step 228 that “OK” is set, or it isdetermined at step 229 that “OK” is not set, the permission proposal 1is not set in the message outputted to the user and the followingprocess is performed.

Thereafter, the validity verification part 25 adds “1” to Y (step 231),and determines whether or not Y exceeds the total number N of SASdevices included in the ZP table (step 232). And if Y does not exceedthe total number N of SAS devices, the operation goes to step 223.

Also, if Y exceeds the total number N of SAS devices, the validityverification part 25 adds “1” to X (step 233), and determines whether ornot X exceeds the total number N of SAS devices (step 234). And if Xdoes not exceed the total number N of SAS devices, the operation goes tostep 222. Also, if X exceeds the total number N of SAS devices, theprocess is ended.

In the flowchart of FIG. 6, the process where X=Y, namely, the processfor the cell corresponding to the row and column in which the same SASdevice is set is not referred to. However, if nothing can be set in thecell corresponding to the row and column in which the same SAS device isset in the ZP table, the process where X=Y may be skipped.

Also, in the flowchart of FIG. 6, in the case where the combination ofthe attributes of port is initiator and target, or initiator andinitiator/target, the permission proposal 2 is set if “OK” is set.However, even in the case where the combination of the attributes ofport is initiator/target and target, or initiator/target andinitiator/target, the permission proposal 2 may be set if “OK” is set.

In a second operation example, the operations of the zone manager module20 is similar to the operations shown in FIG. 3.

However, the second operation example is different from the firstoperation example in that the ZP table with information set for eachZGID is generated at step 202, and the I/T table with information setfor each ZGID is generated at step 204, although the ZP table and theI/T table with information set for each SAS device are generated in thefirst operation example.

Also, for the second operation example, the validity verificationprocess by the validity verification part 25 at step 205 is differentfrom the first operation example.

The second operation example is different from the first operationexample in that the permission verification process for verifyingwhether to make the permission proposal is performed for the settingbetween each ZGID, although the permission verification process forverifying whether to make the permission proposal is performed for thesetting between each port. That is, in this first operation example, theuser may perform the zoning by narrowing the object only to theintuitive ID relevance such as a set relationship between Blade andDisk.

Further, the second operation example is different from the firstoperation example in that a division verification process for verifyingwhether to make the division proposal is performed. That is, in the casewhere only some of the ports included in a certain ZGID cannot becomethe initiator or the target, a policy of not permitting theclassification of ports into the ZGID is taken, thereby proposing to theuser that some of the ports are separated from the ZGID.

Furthermore, the second operation example is different from the firstoperation example in that a merge verification process for verifyingwhether to make the merge proposal is performed. That is, it is supposedthat for a certain initiator, access to a certain target is permittedand access to another target is also permitted. In this case, if twotargets cannot become the initiator, it is notified that these targetscan be merged into one ZGID, because these targets are included in thesame ZGID without influence.

In an execution sequence of the permission verification process, thedivision verification process and the merge verification process is notspecifically limited, but they are preferably performed in the sequenceof the division verification process, the merge verification process andthe permission verification process. Accordingly, the process inaccordance with the flowchart of FIG. 3 in this sequence will bespecifically described below.

The division verification process will be described below.

FIG. 7 is a view showing the examples of the table generated in thiscase.

First, the user sets the ZP table, and the ZP table generation part 21stores the ZP table in the ZP table storage part 22 at step 202. Theuser may set the ZP table as shown in FIG. 7( a). In the secondoperation example, unlike the first operation example, ZGID that isidentification information of the zone group is set in the row andcolumn of the ZP table. It should be noted that “OK” in the tableindicates that access between corresponding ZGIDs is permitted.

In the second operation example, a ZGID table defining thecorrespondence between ZGID and SAS device is also stored in a memory,not shown. The ZGID table as shown in FIG. 7( b) may be stored. ThisZGID table may be set in advance by the user.

Also, the I/T table generation part 23 creates the I/T table and storesit in the I/T table storage part 24 at step 204. The I/T table as shownin FIG. 7( c) is created in this example. In this case, the attributesof ports for Blade1-3, Disk1-3 of the storage module 1 and the RAIDcontroller associated with ZGID1 in the ZGID table of FIG. 7( b) areinitiator, target and initiator/target, respectively. Accordingly, theattribute of ZGID 1 is initiator/target. Also, since the attribute ofport for Blade4-6 associated with ZGID2 is initiator, the attribute ofZGID2 is initiator. Further, since the attribute of port for Disk4-6 ofstorage module 1 associated with ZGID3 and the attribute of port forDisk1-6 of storage module 2 associated with ZGID4 are target, theattributes of ZGID3 and ZGID4 are both target.

Thereafter, the validity verification part 25 verifies whether or notdivision is required based on the ZGID table as shown in FIG. 7( b) andthe attribute of port included in ZGID at step 205. In this example,since Blade1-3 cannot become target, the division is proposed. Also,since Disk1-3 of the storage module 1 cannot become initiator, thedivision is proposed. And the ZGID table as shown in FIG. 7( d) isfinally generated. That is, ZGID1 in the ZGID table of FIG. 7( b) isdivided into ZGID1 including Blade1-3, ZGID5 including Disk1-3 of thestorage module 1 and ZGID6 including the RAID controller.

Next, the division verification process by the validity verificationpart 25 at step 205 will be described below in detail.

FIG. 8 is a flowchart showing an operation example of the validityverification part 25 in this case.

First, the validity verification part 25 takes notice of one ZGID in theZGID table (step 241). And it takes notice of one port associated withthis ZGID in the ZGID table (step 242).

Then, the validity verification part 25 discriminates the attribute ofport (step 243).

As a result, if it is determined that the attribute of port isinitiator, the validity verification part 25 records information of theport as information of initiator (step 244). For example, a memory, notshown, is divided into an area for initiator, an area for target and anarea for application/target, and the information of the port is recordedin the area for initiator.

Also, if it is determined that the attribute of a port is target, thevalidity verification part 25 records information of the port asinformation of target (step 245). For example, the memory, not shown, isdivided into an area for initiator, an area for target and an area forapplication/target, and the information of the port is recorded in thearea for target.

Further, if it is determined that the attribute of port isinitiator/target, the validity verification part 25 records informationof the port as information of initiator/target (step 246). For example,the memory, not shown, is divided into an area for initiator, an areafor target and an area for application/target, and the information ofthe port is recorded in the area for initiator/target.

Thereafter, the validity verification part 25 determines whether or notthere is any other port associated with ZGID noticed in the ZGID table(step 247). And if there is any other port, the operation goes to step242.

Also, if there is no other port, it is determined whether or not all theinformation recorded at steps 244 to 246 is recorded as information withthe same attribute (step 248).

As a result, if all the information is recorded as information with thesame attribute, the operation goes to step 255 without performing theprocess for division proposal. For example, if all the attributes ofports included in one ZGID are initiator, target or initiator/target, itis unnecessary to make the division proposal.

On the other hand, if all the information is not recorded as informationwith the same attribute, the validity verification part 25 determineswhether or not there is the information of port recorded as informationof initiator (step 249). And if there is information of port recorded asinformation of initiator, the division proposal of initiator is set inthe message outputted to the user (step 250). Also, if there is noinformation of port recorded as information of initiator, the divisionproposal of initiator is not set in the message outputted to the userand the operation goes to the following step.

Next, the validity verification part 25 determines whether or not thereis information of port recorded as information of target (step 251). Andif there is information of port recorded as information of target, thedivision proposal of target is set in the message outputted to the user(step 252). Also, if there is no information of port recorded asinformation of target, the division proposal of target is not set in themessage outputted to the user and the operation goes to the followingstep.

Next, the validity verification part 25 determines whether or not thereis information of port recorded as information of initiator/target (step253). And if there is information of port recorded as information ofinitiator/target, the division proposal of initiator/target is set inthe message outputted to the user (step 254). Also, if there is noinformation of port recorded as information of initiator/target, thedivision proposal of initiator/target is not set in the messageoutputted to the user and the operation goes to the following step.

Thereafter, the validity verification part 25 determines whether or notthere is any other ZGID in the ZGID table (step 255). And if there isany other ZGID, the operation goes to step 241. Also, if there is noother ZGID, the process is ended.

Next, the merge verification process will be described below.

FIG. 9 is a view showing the examples of the table generated in thiscase.

First, the user sets the ZP table, and the ZP table generation part 21stores the ZP table in the ZP table storage part 22 at step 202. Theuser may set the ZP table as shown in FIG. 9( a). In the secondoperation example, unlike the first operation example, ZGID that isidentification information of the zone group is set in the row andcolumn of the ZP table. It should be noted that “OK” in the tableindicates that access between corresponding ZGIDs is permitted.

In the second operation example, a ZGID table defining thecorrespondence between ZGID and SAS device is also stored in the memory,not shown. The ZGID table as shown in FIG. 9( b) is stored.

And the I/T table generation part 23 creates the I/T table and stores itin the I/T table storage part 24 at step 204. The I/T table as shown inFIG. 9( c) is created in this example.

In this case, since the attributes of ports for Blade 1-3 associatedwith ZGID1 and Blade 4-6 associated with ZGID2 in the ZGID table of FIG.9( b) are initiator, the attributes of ZGID1 and ZGID2 are bothinitiator. Also, since the attribute of port for Disk1-6 of the storagemodule 1 associated with ZGID3 and the attribute of port for Disk1-6 ofthe storage module 2 associated with ZGID4 are target, the attributes ofZGID3 and ZGID4 are both target.

Thereafter, the validity verification part 25 verifies whether or notthe merge is required based on the ZP table as shown in FIG. 9( a) andthe I/T table as shown in FIG. 9( c) at step 205. In this example,access between ZGID1 that is initiator and ZGID3 and ZGID4 that aretarget is permitted, and access between ZGID2 that is initiator andZGID3 and ZGID4 that are target is also permitted. Accordingly, sincethere is no influence even if ZGID1 and ZGID2 are treated as one ZGID, amerge proposal for these ZGIDs is made. Also, access between ZGID3 thatis target and ZGID 1 and ZGID2 that are initiator is permitted, andaccess between ZGID4 that is target and ZGID1 and ZGID2 that areinitiator is also permitted. Accordingly, since there is no influenceeven if ZGID3 and ZGID4 are treated as one ZGID, a merge proposal forthese ZGIDs is made.

Next, the merge verification process by the validity verification part25 at step 205 will be described below in detail.

FIG. 10 is a flowchart showing an operation example of the validityverification part 25 in this case.

First, the validity verification part 25 substitutes “1” into variable Xrepresenting the index in the longitudinal direction of the ZP tablestored in the ZP table storage part 22 (step 261). And the subsequentprocess is performed while X is incremented one by one. When X is “1”,“2” and “3”, the process is performed taking notice of the first row,the second row and the third row from the top in the ZP table.

Next, a process considering the Xth row from the top in the ZP tablewill be described below.

The validity verification part 25 firstly discriminates the attribute ofZGID in the Xth row from the top in the ZP table (step 262).

As a result, if it is determined that the attribute of ZGID isinitiator, the validity verification part 25 records the correspondenceinformation between the ZGID of initiator and the ZGID of target forwhich “OK” is set to the ZGID of initiator (step 263). For example, anarea for the ZGID of initiator is provided in the memory, not shown, andthe ZGID of target is recorded in the area. In the ZP table of FIG. 9(a), taking notice of ZGID1 that is initiator in the first row, “OK” isset to the cell corresponding to ZGID3 and ZGID4 that are target.Accordingly, information of ZGID3 and ZGID4 is recorded in the area forZGID 1. Also, for ZGID2 that is initiator in the second row, “OK” is setto the cell corresponding to ZGID3 and ZGID4 that are target.Accordingly, information of ZGID3 and ZGID4 is recorded in the area forZGID2.

Also, if it is determined that the attributes of ZGID is target, thevalidity verification part 25 records the correspondence informationbetween the ZGID of target and the ZGID of initiator for which “OK” isset to the ZGID of target (step 264). For example, an area for the ZGIDof target is provided in the memory, not shown, and the ZGID ofinitiator is recorded in the area. In the ZP table of FIG. 9( a), takingnotice of ZGID3 that is target in the third row, “OK” is set to the cellcorresponding to ZGID1 and ZGID2 that are initiator. Accordingly,information of ZGID1 and ZGID2 is recorded in the area for ZGID3. Also,taking notice of ZGID4 that is initiator in the fourth row, “OK” is setto the cell corresponding to ZGID 1 and ZGID2 that are initiator.Accordingly, information of ZGID 1 and ZGID2 is recorded in the area forZGID4.

Further, if it is determined that the attribute of ZGID isinitiator/target, the validity verification part 25 does not record thecorrespondence information and the operation goes to the next step.

Thereafter, the validity verification part 25 adds “1” to X (step 265),and determines whether or not X exceeds the total number M of ZGIDsincluded in the ZP table (step 266). And if X does not exceed the totalnumber M of ZGIDs, the operation goes to step 262.

Also, if X exceeds the total number M of ZGIDs, the validityverification part 25 determines whether or not the correspondenceinformation of ZGID is recorded in the memory (step 267).

As a result, if the correspondence information of ZGID is recorded, itis determined whether or not the correspondence information betweenplural ZGIDs that are initiator and one ZGID that is target exists inthe correspondence information (step 268). And if there is suchcorrespondence information, a merge proposal of initiator is set in themessage outputted to the user (step 269). Also, if there is not suchcorrespondence information, the merge proposal of initiator is not setin the message outputted to the user and the operation goes to the nextstep.

Next, the validity verification part 25 determines whether or not thecorrespondence information between plural ZGIDs that are target and oneZGID that is initiator exists in the correspondence information (step270). And if there is such correspondence information, a merge proposalof target is set in the message outputted to the user (step 271). Also,if there is not such correspondence information, the merge proposal oftarget is not set in the message outputted to the user and the operationgoes to step 267.

Thereafter, if the validity verification part 25 determines that thecorrespondence information of ZGID is not recorded in the memory, theprocess ends.

The permission verification process will be described below.

A case where the attribute of ZGID is initiator or target will bedescribed below.

FIG. 11 is a view showing the examples of the table generated in thiscase.

First, the user sets the ZP table, and the ZP table generation part 21stores the ZP table in the ZP table storage part 22 at step 202. Theuser may set the ZP table as shown in FIG. 11( a). In the secondoperation example, unlike the first operation example, ZGID that isidentification information of the zone group is set in the row andcolumn of the ZP table. It should be noted that “OK” in the tableindicates that access between corresponding ZGIDs is permitted.

Also, the I/T table generation part 23 creates the I/T table and storesit in the I/T table storage part 24 at step 204. In this case, since theattribute of ZGID is initiator or target, the I/T table as shown in FIG.11( b) is created. That is, the attributes of ZGID1 and ZGID2 are set asinitiator, and the attributes of ZGID3 and ZGID4 are set as target.

Thereafter, the validity verification part 25 performs a validityverification process based on the ZP table as shown in FIG. 11( a) andthe I/T table as shown in FIG. 11( b). In this validity verificationprocess, information on accessibility to any other combination than thecombination of ZGIDs to which the user sets “OK” in the ZP table can beautomatically generated. Herein, since it is implicitly known that thedata output destination of ZGID1 is ZGID3 and the data outputdestination of ZGID2 is ZGID4, with a server to disk configuration, fromthe I/T table of FIG. 11( b), the settings are unchanged as shown inFIG. 11( c).

Secondly, a case where the attribute of ZGID is initiator, target orinitiator/target will be described below.

FIG. 12 is a view showing examples of the table generated in this case.

First, the user sets the ZP table, and the ZP table generation part 21stores the ZP table in the ZP table storage part 22 at step 202. Theuser may set the ZP table as shown in FIG. 12( a). This is the same asshown in FIG. 11( a). It should be noted that “OK” in the tableindicates that access between corresponding ZGIDs is permitted.

Also, the I/T table generation part 23 creates the I/T table and storesit in the I/T table storage part 24 at step 204. Since the attribute ofZGID is initiator, target or initiator/target in this example, the I/Ttable as shown in FIG. 12( b) is created. That is, the attributes ofZGID1 and ZGID2 are set as initiator, the attribute of ZGID3 is set asinitiator/target, and the attribute of ZGID4 is set as target.

Thereafter, the validity verification part 25 performs a validityverification process based on the ZP table as shown in FIG. 12( a) andthe I/T table as shown in FIG. 12( b) at step 205. In this validityverification process, information on accessibility to any othercombination than the combination of ZGIDs to which the user sets “OK” inthe ZP table can be automatically generated. ZGID3 can become initiator,and it is estimated that some backup agent is mounted on ZGID3. Also,because ZGID4 is only a target and a hard disk, it is used as the backupdestination. There is a possibility that the target for the initiator ofZGID3 may be ZGID3 itself, or ZGID4, whereby it is possible to proposeto the user that access to each is permitted to improve the performance.

The operation of the permission verification process by the validityverification part 25 at step 205 is equivalent to the operationperformed by replacing port with ZGID in the description of theflowchart of FIG. 6.

As described above, in this embodiment, the validity of settings in theZP table is verified using the attribute of port of the SAS device orthe attribute of ZGID as the set thereof. A determination may beautomatically made as to whether or not the settings in the ZP table bythe user are appropriate. Particularly in the second operation example,the user may perform the zoning by narrowing the object only to theintuitive relevance of port such as the relationship between server anddisk, and a proposal or warning for the candidate of optimal ZP table isautomatically made, whereby the trouble or mistake of zoning by the usercan be greatly reduced.

Also, the mergeable zone group can be automatically detected byreferring to the attribute information of port for the SAS device or theZP table.

Moreover, there may be automatic detection of a support for the systemrequiring access between the hard disks such as a serverless copy byusing the attribute information of port (information that the port isinitiator, target or initiator/target).

Though the invention has been described above with the above discussedembodiments, the technical scope of the invention is not limited to theabove embodiment. It will be apparent to a person skilled in the artthat various variations or modifications may be made without departingfrom the spirit or scope of the invention.

1. A computer implemented method for managing zone information fordevices in a network, comprising: providing a zone group table includingentries for different pairs of zones, wherein each entry indicateswhether access between a pair of the zones is permitted; providing anattribute zone table indicating whether devices in the zones areinitiator, target and/or initiator/target; for a selected zonecomprising one of the zones indicated in the zone group table,indicating whether ports in the devices in the selected zone have aninitiator, target and/or initiator/target attribute as indicated in theattribute zone table; determining whether all the ports in the devicesin the selected zone have the same attribute of initiator, target orinitiator/target; and indicating a division proposal for the selectedzone proposing to separate devices in the selected zone into at leastone new zone in response to determining that all the ports in theselected zone do not have the same attribute.
 2. The method of claim 1,wherein the operations of indicating the attributes of the ports indevices in the selected group, determining whether the ports have thesame attribute, and indicating the division proposal are performed foreach zone indicated in the zone group table.
 3. The method of claim 1,further comprising: determining whether at least one of the ports in theselected zone has a first attribute of the attributes in response todetermining that all the ports in the selected zone do not have the sameattribute, wherein indicating the division proposal comprises setting adivision proposal of the first attribute in a message to output to auser.
 4. The method of claim 3, further comprising: determining whetherat least one of the ports in the selected zone has a second attribute ofthe attributes in response to determining that all the ports in theselected zone do not have the same attribute, wherein indicating thedivision proposal comprises setting a division proposal of the secondattribute in the message to output to the user.
 5. The method of claim4, further comprising: determining whether at least one of the ports inthe selected zone has a third attribute of the attributes in response todetermining that all the ports in the selected zone do not have the sameattribute, wherein indicating the division proposal comprises setting adivision proposal of the third attribute in the message to output to theuser.
 6. The method of claim 1, wherein the zone group table comprises afirst zone group table, further comprising: providing a second zonegroup table identifying devices included in the zones indicated in thefirst zone group table; indicating in the division proposal the selectedzone as including at least one device indicated in the second zone grouptable for the selected zone having a first attribute of the attributesof the devices included in the selected zone; indicating in the divisionproposal a new zone as including at least one device indicated in thesecond zone group table for the selected zone having a second attributeof the attributes of the devices included in the selected zone.
 7. Themethod of claim 6, wherein the new zone comprises a first new zone, andwherein the indicating the division proposal comprises: determiningwhether the attributes of the devices in the selected zone include athird attribute of the attributes; and indicating in the divisionproposal a second new zone as indicating at least one device indicatedin the second zone group table for the selected zone having the thirdattribute.
 8. A system for managing zone information for devices in anetwork, comprising: a processor; and a zone manager module executed bythe processor to perform operations, the operations comprising:providing a zone group table including entries for different pairs ofzones, wherein each entry indicates whether access between a pair of thezones is permitted; providing an attribute zone table indicating whetherdevices in the zones are initiator, target and/or initiator/target; fora selected zone comprising one of the zones indicated in the zone grouptable, indicating whether ports in the devices in the selected zone havean initiator, target and/or initiator/target attribute as indicated inthe attribute zone table; determining whether all the ports in thedevices in the selected zone have the same attribute of initiator,target or initiator/target; and indicating a division proposal for theselected zone proposing to separate devices in the selected zone into atleast one new zone in response to determining that all the ports in theselected zone do not have the same attribute.
 9. The system of claim 8,wherein the operations of indicating the attributes of the ports indevices in the selected group, determining whether the ports have thesame attribute, and indicating the division proposal are performed foreach zone indicated in the zone group table.
 10. The system of claim 8,wherein the operations further comprise: determining whether at leastone of the ports in the selected zone has a first attribute of theattributes in response to determining that all the ports in the selectedzone do not have the same attribute, wherein indicating the divisionproposal comprises setting a division proposal of the first attribute ina message to output to a user.
 11. The system of claim 10, wherein theoperations further comprise: determining whether at least one of theports in the selected zone has a second attribute of the attributes inresponse to determining that all the ports in the selected zone do nothave the same attribute, wherein indicating the division proposalcomprises setting a division proposal of the second attribute in themessage to output to the user.
 12. The system of claim 11, wherein theoperations further comprise: determining whether at least one of theports in the selected zone has a third attribute of the attributes inresponse to determining that all the ports in the selected zone do nothave the same attribute, wherein indicating the division proposalcomprises setting a division proposal of the third attribute in themessage to output to the user.
 13. The system of claim 8, wherein thezone group table comprises a first zone group table, wherein theoperations further comprise providing a second zone group tableidentifying devices included in the zones indicated in the first zonegroup table; indicating in the division proposal the selected zone asincluding at least one device indicated in the second zone group tablefor the selected zone having a first attribute of the attributes of thedevices included in the selected zone; indicating in the divisionproposal a new zone as including at least one device indicated in thesecond zone group table for the selected zone having a second attributeof the attributes of the devices included in the selected zone.
 14. Thesystem of claim 13, wherein the new zone comprises a first new zone, andwherein the indicating the division proposal comprises: determiningwhether the attributes of the devices in the selected zone include athird attribute of the attributes; and indicating in the divisionproposal a second new zone as indicating at least one device indicatedin the second zone group table for the selected zone having the thirdattribute.
 15. A computer storage device including a zone manager moduleexecuted in a server system to manage zone information for devices in anetwork, wherein the zone manager module performs operations, theoperations comprising: providing a zone group table including entriesfor different pairs of zones, wherein each entry indicates whetheraccess between a pair of the zones is permitted; providing an attributezone table indicating whether devices in the zones are initiator, targetand/or initiator/target; for a selected zone comprising one of the zonesindicated in the zone group table, indicating whether ports in thedevices in the selected zone have an initiator, target and/orinitiator/target attribute as indicated in the attribute zone table;determining whether all the ports in the devices in the selected zonehave the same attribute of initiator, target or initiator/target;indicating a division proposal for the selected zone proposing toseparate devices in the selected zone into at least one new zone inresponse to determining that all the ports in the selected zone do nothave the same attribute.
 16. The computer storage device of claim 15,wherein the operations of indicating the attributes of the ports indevices in the selected group, determining whether the ports have thesame attribute, and indicating the division proposal are performed foreach zone indicated in the zone group table.
 17. The computer storagedevice of claim 15, wherein the operations further comprise: determiningwhether at least one of the ports in the selected zone has a firstattribute of the attributes in response to determining that all theports in the selected zone do not have the same attribute, whereinindicating the division proposal comprises setting a division proposalof the first attribute in a message to output to a user.
 18. Thecomputer storage device of claim 17, wherein the operations furthercomprise: determining whether at least one of the ports in the selectedzone has a second attribute of the attributes in response to determiningthat all the ports in the selected zone do not have the same attribute,wherein indicating the division proposal comprises setting a divisionproposal of the second attribute in the message to output to the user.19. The computer storage device of claim 18, wherein the operationsfurther comprise: determining whether at least one of the ports in theselected zone has a third attribute of the attributes in response todetermining that all the ports in the selected zone do not have the sameattribute, wherein indicating the division proposal comprises setting adivision proposal of the third attribute in the message to output to theuser.
 20. The computer storage device of claim 15, wherein the zonegroup table comprises a first zone group table, wherein the operationsfurther comprise: providing a second zone group table identifyingdevices included in the zones indicated in the first zone group table;indicating in the division proposal the selected zone as including atleast one device indicated in the second zone group table for theselected zone having a first attribute of the attributes of the devicesincluded in the selected zone; indicating in the division proposal a newzone as including at least one device indicated in the second zone grouptable for the selected zone having a second attribute of the attributesof the devices included in the selected zone.
 21. The computer storagedevice of claim 20, wherein the new zone comprises a first new zone, andwherein the indicating the division proposal comprises: determiningwhether the attributes of the devices in the selected zone include athird attribute of the attributes; and indicating in the divisionproposal a second new zone as indicating at least one device indicatedin the second zone group table for the selected zone having the thirdattribute.